Ohio has moved from the prediction markets to the companies that serve them: every gaming licensee must confirm by October 30 that it has stopped
Ohio's first round of enforcement went at the front door: ten letters on October 2 to the exchanges and brokers that sell sports event contracts to Ohio residents, with an October 16 deadline. Most of them kept trading. The second round, dated October 20, goes at the plumbing. A prediction market needs prices, someone to quote both sides, someone to watch for match-fixing and someone to test and secure the systems, and some of those services come from companies that also hold Ohio gaming licences. Those licences are what the Commission can actually take away.
What the October 20 letter says
The letter is signed by the Commission's interim executive director, Andromeda Morrison, and was presented to the seven commissioners at their October 21 meeting. It says the Commission is "deeply concerned by reports" that licensees continue to support entities offering sports event contracts in Ohio, and that such support "reflects on the licensee's character, integrity, honesty, and reputation." It does not name any licensee.
| Element | What the letter says |
|---|---|
| Who must comply | Fantasy contest operators; sports gaming proprietors, management services providers and mobile management services providers; suppliers and their key employees; certified independent integrity monitors and testing laboratories; applicants for any of these licences |
| What must stop | Liquidity provision and market making, integrity monitoring, equipment, data security and other technology services for unlicensed sports event contract operators serving Ohio |
| What is not covered | Event contracts on non-sports outcomes, which the Commission says do not violate Ohio gaming law |
| Safe harbour | A licensee that is also a futures commission merchant or introducing broker is compliant if Ohio customers cannot reach sports contracts on a designated contract market |
| Deadline | Confirm compliance by October 30, 2026 and preserve supporting records |
| Consequence | Possible investigation, reopened suitability review, and licence denial, non-renewal, suspension or revocation |
The legal theory is not new. The Commission says its position has been the same since early 2025: offering sports event contracts to people in Ohio is sports gaming and needs an Ohio licence. It also issued written guidance to licensees in August 2025. What changed is the Sixth Circuit's September 25 decision in Kalshi's cases against Ohio and Tennessee, which held that Kalshi had not shown its sports contracts are swaps and that federal commodities law does not preempt either state's gambling law. Inside the Sixth Circuit, the Commission no longer has to argue that point from scratch.
Who the letter reaches
Ohio regulates 13 online sportsbooks, according to Casino.org, and the letter goes to all of them along with the much longer list of suppliers and service providers behind them. The overlap with prediction markets is not hypothetical. FanDuel and DraftKings, two of Ohio's largest licensed books, run prediction market products in states where they do not hold sportsbook licences, Casino.org reported, and several daily fantasy operators that hold Ohio fantasy licences have launched prediction products of their own. Holland & Knight, in a client note on October 21, said some operators with sports or fantasy licences in Ohio and other states have already given up licences rather than choose.
The letter is also aimed at a quieter layer: market makers that quote prices on exchanges, integrity monitors that scan for suspicious betting, and laboratories that certify gaming systems. A market maker that holds an Ohio supplier licence and provides liquidity on sports contracts that Ohio residents can trade is now, in the Commission's reading, putting that licence at risk. Utah made a similar move from the other direction on October 20, when it named Kalshi's market maker, Susquehanna, as a defendant in its state-court suit.
Polymarket sued first
Four days before the licensee letter, on the October 16 deadline, QCX LLC, which operates Polymarket US, sued Ohio Attorney General Andy Wilson, Morrison and the seven commissioners in the U.S. District Court for the Southern District of Ohio, case No. 2:26-cv-01502, assigned to Judge Douglas R. Cole. The 46-page complaint, filed by Squire Patton Boggs and Gibson, Dunn & Crutcher, makes two arguments. The first is the familiar one: the Commodity Exchange Act gives the CFTC exclusive jurisdiction over contracts on a designated contract market, which Polymarket US has been since July 9, 2025. The second is newer. Polymarket says Ohio's licensing system discriminates against interstate commerce, because Type A licences require an in-state business presence, regulators weigh local economic contributions, licences are generally capped at 25 proprietors, and wagering servers and customers must be in Ohio.
The preemption argument faces the Sixth Circuit's September ruling, which binds Judge Cole. The Commerce Clause argument does not, which is presumably why it leads. Joshua Kirschner of Holland & Knight told SBC Americas he doubted it would succeed, because it treats Ohio's whole sports betting regime as protectionist and "shouldn't be read to be saying that every state sports betting regime would be illegal, per se." Morrison told the commissioners the Commission is reviewing the complaint with the attorney general's office and will "vigorously defend" Ohio's law. Chairman Thomas Stickrath joked that the commissioners appreciate the director "getting us sued each week."
Ohio's campaign so far, by date
| Date | Step |
|---|---|
| Mar 2025 | First Commission letter to Kalshi; position that sports event contracts are sports gaming |
| Aug 2025 | Written guidance warning licensees about prediction market work |
| Apr 2026 | $5 million fine against Kalshi |
| Sep 25, 2026 | Sixth Circuit rules for Ohio and Tennessee against Kalshi |
| Oct 2, 2026 | Cease-and-desist letters to Polymarket, Robinhood, Coinbase, Novig, Underdog, ProphetX, Webull, Plus500, Gemini Titan and Moomoo |
| Oct 16, 2026 | Deadline passes; Plus500US is the only recipient confirmed to stop; Polymarket US sues |
| Oct 20, 2026 | Letter to all sports gaming and fantasy licensees and applicants |
| Oct 21, 2026 | Morrison briefs the Commission; says talks with several companies are "productive" and the issues "remain under investigation" |
| Oct 30, 2026 | Licensees must confirm compliance |
The count after the first round is thin: one compliance out of ten, one lawsuit against the state, and Kalshi, which was not on the list because Ohio is already litigating with it, still offering sports contracts while its petition for rehearing in the Sixth Circuit is pending. Governor Mike DeWine has said the attorney general will sue the companies that did not comply, and that it is "gambling. It's nothing else." No such suit had been reported by October 23. Morrison's line to the commissioners was that the Commission "cannot sit utterly by while watching Ohio law be violated."
What to watch on October 30
Three things. First, whether the Commission publishes the replies, or a count of them; it released the October 2 letters, and a list of licensees that certified would show which suppliers chose Ohio over prediction market work. Second, whether any large sportsbook group changes what it offers elsewhere. An operator that runs a prediction product in states where it has no sportsbook licence can comply in Ohio by keeping Ohio customers out, which most already do; the harder cases are suppliers whose service to an exchange is national. Third, whether the attorney general finally files the suits DeWine has promised, which would put Ohio in court on both sides: defending against Polymarket in Columbus and suing the platforms that stayed.
Method and limits
The letter's contents, scope footnote and safe harbour are taken from reports by Covers, RG.org (which cites a copy obtained by The Event Horizon), Legal Sports Report, CDC Gaming and Casino.org, and Holland & Knight's client alert; we have not seen the letter itself. Casino.org dates the letter October 20 and Holland & Knight describes its confirmation at the October 21 meeting. Case details for Polymarket's suit are from Yogonet and SBC Americas; we have not read the complaint. The count of 13 online sportsbooks and the statement about FanDuel and DraftKings are Casino.org's. The 2025 and April 2026 entries in the timeline are from our earlier Ohio reporting. No licensee had said publicly how it will respond when this was published.
Frequently asked questions
What did Ohio tell gaming licensees on October 20, 2026?
The Ohio Casino Control Commission told sports gaming and fantasy contest licensees, suppliers, integrity monitors, testing laboratories and applicants to immediately stop providing liquidity, market making, integrity monitoring, equipment, data security or other technology services to platforms offering unlicensed sports event contracts in Ohio, and to confirm compliance by October 30, 2026.
What happens to a licensee that does not comply?
The Commission says continued support raises suitability concerns and could lead to an investigation and to licence denial, non-renewal, suspension or revocation. No fine amount is stated in the reported letter.
Does the Ohio letter cover election or economic prediction markets?
No. The letter concerns sports event contracts. The Commission said offering non-sports event contracts does not violate Ohio gaming law.
Why did Polymarket sue Ohio?
Polymarket US, operated by QCX LLC, sued on October 16, 2026 in the Southern District of Ohio, case No. 2:26-cv-01502, arguing that the Commodity Exchange Act preempts Ohio enforcement and that Ohio's licensing rules discriminate against out-of-state businesses in violation of the Commerce Clause. It seeks preliminary and permanent injunctions.
Related
- Is Kalshi legal in Ohio?
- Is Kalshi legal in your state? The 50-state tracker
- Ohio's October 16 deadline passed: who complied
- Ohio's ten cease-and-desist letters
- Odds converter: cent prices, American odds and the vig
Sources
- Covers, Ohio targets gaming companies working with prediction markets, 22 October 2026, for the letter, the deadline, record preservation, the non-sports carve-out and the DeWine quotation.
- RG.org, Ohio orders licensees to stop serving prediction markets, 21 October 2026, for the licensee categories in the letter's footnote and the FCM and introducing broker safe harbour.
- Legal Sports Report, Ohio warns licensees to cut ties with prediction markets, October 2026, for compliance status and the Morrison and Stickrath quotations.
- CDC Gaming, Ohio licensees providing services to prediction markets may impact suitability, 21 October 2026, for the Commission meeting and the 46-page complaint.
- Casino.org, Ohio targets prediction markets, orders licensed sportsbooks to comply, 22 October 2026, for the 13 online sportsbooks and FanDuel and DraftKings.
- Yogonet, Polymarket sues Ohio over sports betting restrictions, 22 October 2026, for the case number, judge, defendants, counsel and claims.
- SBC Americas, Polymarket sues Ohio over discriminatory betting rules, 20 October 2026, for the Kirschner quotation.
- Holland & Knight, Ohio pulls the lever: gaming licensees ordered to cease, 21 October 2026, for the meeting date and licences relinquished.
18+ only. This page reports regulatory letters, court filings and public statements. It is not legal, financial or betting advice. If gambling stops being fun, help is available at 1-800-GAMBLER.